The   Pendulum
 
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Still under de•re•construction 
                   
 
 
 
Swing out   Normally a 'pendulum' would swing out soon, but - by analogy with the pendulum of a clock - I wanted to have the metal ball in an infinite oscillation. Moreover, I wanted to gain a stronger impression than the movement of a pendulum of a clock would give: it had to add some tenseness to the swing.    
 
Principle   By applying an electronic circuitry and electromagnets, it was possible to not only acquire the infinite oscillation, but also a brief fixed moment in the extreme positions of the swing at the left and right walls.    
 
 
Principle
 
 
Tensity   The motion of the pendulum became an apparent unstable balance because of this, making it difficult to enter the room without a certain fear to disturb the motion, while at the same time the short 'rests' invited to the possibility to quickly get passed the object.  
 
The works   A small room was prepared for the pendulum by placing two electromagnets and the wiring in the walls. 
 
The object itself was made from two so called tank bottoms, forming a perfect circle after welding them. 
 
Two counterpart electromagnets had been placed in the ball as well. A reverse magnetic field was required - after the short 'fix' of the swing at the walls - to 'push' the ball to the next extreme position. Also a rigid fastening with bearing was necessary to balance the swing.
   
 
 
The works
 
 
Circuit   Timing was critical in this installation. The magnets were switched by timing alone - no contact switches were used as they proved to be unreliable, but as a starting point one magnet was in an active state. The ball had to be 'stuck' to the magnet and the system would start with a simple on/off button.  
 
Help   A little help with the timing came from the feedback of induction by the magnetic fields, which kept the system perfectly balanced. 
 
The pendulum's brief fixed moment in the extreme positions of the swing at the left and right walls - i.e. the 'sticking' of the ball to the magnets - occurred very smoothly and a nice little click sound could be heard when the ball 'touched'. 
 
 
 
Circuit
 
BACK   'Pendulum' - 2 metal tank halves, iron tube, bearing / hanging, electronic switching device, power supply 220 V. ~, electromagnets - 1977    
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